Magneto-testing machine



0. w. ONAN. MAGNETO TESTING MACHINE.

- APPLICATION FILED MAYIZ. 1919.

1,394,215. Patented Oct. 18, 1921..

inventor I David 511 Oman fiyfl y' UNITED STATES DAVID W. ONALN, OF MINNEAPOLIS, MINNESOTA.

MAGNETO-TES'IING MACHINE.

Specification of Letters Patent.

Patented Oct. 18, 1921.

Application filed May 12, 1919. Serial No. 296,516.

T 0 atZZ whom it may concern:

Be it known that I, DAVID W. ONAN, a citizen of the United States, residing at Minneapolis, in the county of Hennepin and State of Minnesota, have invented certain new and useful Improvements in Magneto Testing Machines, of which the following is a specification. v

My invention relates to magneto testmg machines and an object is to provide a ma chine in which the magneto or other electrical unit to be tested can be securely held in place and driven at various speeds, as desired, from a suitable source of power. Another object is to provide a machine of this character which is easy to operate, eflicient in action, and in which the magneto or other unit may be readily connected to an electrical measuring instrument, such as an ammeter.

The full objects and advantages of my invention will appear in connection with the detailed description thereof and the novel features embodied in my inventive idea will be particularly pointed out in the claims.

In the drawings which illustrate the application of my invention,--

Figure 1 is a View in perspective. Fig. 2 is a detailed view, partly in longitudinal section, of a modified form of bed. Fig. 3 is a view in perspective of a structure shown in Fig. 2. Fig. 4 is a side view of the driving cone pulleys. Fig. 5 is a side view of a pulley for attachment to the magneto shaft.

Referring to the particular construction shown in the drawings, the support or base portion of the machine consists of a transverse member 10, a transverse member 12 having feet 14 and two longitudinal tubular members 16 and 18 extending between the members 10 and 12. The support member may be secured to a bench, or in any other suitable way. The members 16 and 18 at one end are secured in holes in lugs 20 extending upwardly from the transverse member 10, and at the other end are secured in holes extending through the transverse member 12. Integrally formed standards 22 extend upwardly from the transverse member 12 and are provided with bearings for a driving shaft 24 provided with fast and loose pulleys 26 and 28 positioned between the standards 22. A belt shifter 30 is used to shift the driving belt, by which the shaft 24 is driven, to either one of the pulleys 26 and 28, and this shifter extends downwardly with a screw threaded rod 42 having a wing member 44 secured to its upper end, and a clamp 46 swiveled on its lower end. This clamp is adapted to hold a magneto A securely upon the bed 34. A driven pulley 48,

shown particularly in Fig. 5, is adapted to be secured to the shaft of the magneto and for this purpose may be provided with a screw threaded hole. The pulley 48 is driven by means of a belt 50 from the driving pulley 52 secured to the driving shaft 24. The pulley 52 is preferably a cone pulley in order that the magneto shaft may be driven at different speeds. An ammeter 54 is secured to a support 56 attached to a bracket 58 extending from the bearing member of the shaft 24. The magneto and the ammeter may be connected by wires 60 which extend through the hollow member 16 and a pipe 61. The cone pulley 52 may be adjustably held on either end of the shaft 24 and a catch 62 is provided at each end of the shaft for this purpose. The magneto may obviously be positioned upon the bed so as to be driven from the .cone pulley placed on either end of the shaft 24. The bed 34 may be adjusted longitudinally upon loosening the set screw 64 in order that different sizes of cone portions of the pulley 52 may be used. In Fig. 2 the bed 84 is shown provided with an auxiliary bed 66 which has flanges 68 adapted to slidably engage underneath flanges 70 on the bed 34 so that the auxiliary bed may be adjusted transversely. The auxiliary bed is shown with a depression 72 adapted to receive a magneto B of a differenttype from A and this bed is also provided with an arm 40, the overhanging end of which has a screw threaded opening through which extends the threaded rod 42', upon the lower end of which is swiveled a clamp 46. When the clamp is turned down to hold the magneto the flanges 68 will pinch upon the flanges 70 and hold the auxiliary bed securely in place.

The operation and advantages of my invention will be readily understood from the foregoing description. The magneto or unit to be tested is securely clamped in place upon the bed and connected up with the ammeter by wires leading thereto. The driven pulley is placed upon the magneto shaft and connected by the belt with the cone pulley for driving at the desired speed after the belt from the source of power has been shifted upon the fast pulley of the driving shaft.

7 I claim:

1. A magneto testing machine comprising two end supporting members, longitudinal tubular members connecting said end members, hearings on one of said end members for supporting a driving shaft, a driving pulley attached to said shaft, a bed mounted on the said longitudinal members for holdinga magneto to betested, a driven pulley adapted to be detachably secured to the shaft of the magneto, and means for driving said driven pulley from said driving pulley.

2, A magneto testing machine comprising a support having two hollow longitudinal members, a driving shaft journaled in said support, an ammeter mounted on said support, a belt shifter embodying a rod extending through one of said hollow members and having a belt shifting arm secured to one end thereof and a handle secured to the other end thereof, wires extending from the ammeter through the other of said hollow members and adapted to be connected up with the magneto, a bed mounted on said hollow members for holding the magneto, and means for driving the shaft of the magneto from said driving shaft.

In testimony whereof I hereunto aflix my signature.

DAVID W. ONAN. 

